4 files changed, 133 insertions, 0 deletions
diff --git a/contests/Round849/C/main b/contests/Round849/C/main
new file mode 100755
index 0000000..7f05022
--- /dev/null
+++ b/contests/Round849/C/main
diff --git a/contests/Round849/C/main.cpp b/contests/Round849/C/main.cpp
new file mode 100755
index 0000000..91c1a12
--- /dev/null
+++ b/contests/Round849/C/main.cpp
@@ -0,0 +1,105 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+using ll = long long;
+using pi = pair<int, int>;
+using vpi = vector<pi>;
+using vi = vector<int>;
+using vll = vector<long long>;
+using mpii = map<int, int>;
+using mpll = map<ll, ll>;
+using db = long double;
+
+#define pb push_back 
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+#define lb lower_bound
+#define ub upper_bound
+
+const int MOD = (int)1e9 + 7;
+const db PI = acos((db)-1);
+const int dx[4]{1, 0, -1, 0};
+const int dy[4]{0, 1, 0, -1};
+
+//pretty printing
+template<typename K, typename V>
+void printm(const map<K, V> &mp) {
+  cerr << "{" << endl;
+  for (auto p : mp) {
+    cerr << "  { " << p.first << " : " << p.second << " }\n";
+  }
+  cerr << "}" << endl;
+}
+template<typename T>
+void printv(const vector<T> &v) {
+  cerr << "[";
+  for (int i = 0; i < v.size(); i++) {
+    if (i == v.size() - 1) {
+      cerr << v[i];
+    } else {
+      cerr << v[i] << ", ";
+    }
+  }
+  cerr << "]\n";
+}
+
+template<typename T>
+void printvv(const vector<vector<T>> &v) {
+  cerr << "[\n";
+  for (auto &vec : v) {
+    cout << "  ";
+    printv(vec);
+  }
+  cerr << "]\n";
+}
+void print() {
+  cerr << "\n";
+}
+
+template<typename T, typename... TS>
+void print(T val, TS... vals) {
+  cerr << val << " ";
+  print(vals...);
+}
+
+
+/* stuff you should look for:
+  ---------------------------
+   * special cases (n=1?)
+   * int overflow, array bounds
+   * do smth instead of nothing and stay organized
+   * WRITE STUFF DOWN
+   * DON'T GET STUCK ON ONE APPROACH
+ */
+
+int countPairs(string &str) {
+  int cnt = 0;
+  for (int i = 0; i < str.length() / 2; i++) {
+    if (str[i] != str[str.length() - 1 - i]) {
+      cnt++;
+    } else {
+      break;
+    }
+  }
+  return cnt;
+}
+
+void solve() {
+  int n;
+  cin >> n;
+  string str;
+  cin >> str;
+  cout << str.length() - 2 * countPairs(str) << '\n';
+}
+
+int main () {
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  int tt;
+  cin >> tt;
+  while(tt--) {
+    solve();
+  }
+}
+
+
diff --git a/contests/Round849/C/main_input0.txt b/contests/Round849/C/main_input0.txt
new file mode 100644
index 0000000..b07910f
--- /dev/null
+++ b/contests/Round849/C/main_input0.txt
@@ -0,0 +1,19 @@
+9
+3
+100
+4
+0111
+5
+10101
+6
+101010
+7
+1010110
+1
+1
+2
+10
+2
+11
+10
+1011011010
diff --git a/contests/Round849/C/main_output0.txt b/contests/Round849/C/main_output0.txt
new file mode 100644
index 0000000..89375dd
--- /dev/null
+++ b/contests/Round849/C/main_output0.txt
@@ -0,0 +1,9 @@
+1
+2
+5
+0
+3
+1
+0
+2
+4